Spray coating exhaust system



y 1933- E. G. WHITMORE 1,906,352

SPRAY COATING EXHAUST SYSTEM Filed Aug. 18, 1930 Patented May 2, 1933.

, UNITED STATES BATENT OFFICE EDSON' G. WHI'I'MORCE, OF TOLEDO, OHIO, ASSIGNOR TO THE DE VILBISS COMPANY, OF

TOLEDO, OHIO, A CORPORATION OF OHIO i SPRAY COATING EXHAUST SYSTEM Application filed August 18, 1930. Serial No. 475,961.

This invention relates to an exhaust system adapted for use in the application of surface coating by the spraying method to portable objects such as a railroad car or other hollow body, and particularly in coating the inside surface thereof. In such operations, particularly where the work is performed indoors, it is important to make provision for protecting the operator from the spray dust and fumes arising from the spraying operation, which would otherwise be inhaled to a greater or less extent, depending upon the particular job and the character of the material being sprayed.

, The object of the present invention is to provide an improved device for creating a draft in such a manner as to protect the operator from the spray dustandfumes resulting from the spray coating of such surfaces without the necessity of; wearing a mask.

This invention is in the nature of an improvement over my earlier application, Ser. No. 312,466, filed October 15, 1928, which has matured to Patent No. 1,774,072.

The invention wil h bg more particularly described with reference to the accompanying drawing, in which Figure 1 is a transverse section through a painting shed in which the invention is installed.

Figure 2 is a side elevation of a portion of the apparatus disclosed in Figure 1.

Figure 3 is a view" showing a partial section of a railroad car with an attachment which is a modified form of a deflector constituting a part of the invention.

Figure 4 is a side elevation on an enlarged scale of the deflector shown in Figure 3.

The invention is illustrated in connection with a shed or booth 5, which may be of a length to receive one or more railroad cars 6 or other objects to be spray coated. The car in the present instance is run in on a track 7, disposed longitudinally within the shed or booth and in spaced relation to the sides thereof. At each side of thecar 6 there is a manifold or conduit 8 into which air under pressure may be introduced by any suitable means. Each conduit 8 is formed. on its upper side with a longitudinal slit 9 may be provided with a fan 10 for increas-' ing the draft. The air is directed into the conduits 9 by a canopy in suitable position v above the car. This canopy includes upper and lower skirts 11 and 12, which are spaced apart to provide a passageway between them and are provided with downwardly disposed spaced extensions 13 and 14.

At each side'of the car the outer skirt extension 13 is provided with keepers 15 in which vertical bars 16 are slidably mounted. A deflector 17 is supported from the lower ends of the bars 16 by links 18. The deflector 17 is adapted to be supported in its adjusted position by counterweights 19 which are connected to the upper ends of the bars 16 by lines 20 passing over suitably located sheaves 21. Whenever the deflector 17 is disposed op'posite the car windows it may be tilted in a direction to deflect the current of air into and through the car and may be held in such position by hooks 22 connected to the bars 16 by cords or cables 23.

Whenever the inside surface of the right hand side of the car is being coated, the left hand deflector 17 as shown in Figure 1 is adjusted to direct a current of air through the car from one side to the other, as indicated by the arrows a. The air stream from both of the conduits 8 is then discharged through the right hand side of the canopy. It is desirable therefore to provide dampers 24 so that the damper at one side of the canopy may be closed while the air passes into the other side. As shown in Figure 1 the action of the damper 24 is automatic. It is pivoted to the skirt 11 and has outwardly extending operating arms 25 through which the bars 16 slide, and the upper ends of these bars are provided with heads'26 which engage the arms 25 to close the dampers whenever the deflector 17- is lowered.

Each skirt extension 13 has downwardly and outwardly inclined guide arms 27 which are engaged by the deflector 17 when the latter is raised so that the lower edge of the deflector will be inclined outwardly to form a converging inlet for the air laden with fumes as it passes into the canopy.

It will be seen therefore that when the deflectors 17 are adjusted as shown in Figure 1, the air from the left hand conduit 8 will be directed through the car windows and across the car so that the fumes will be carried away from an operator who is painting the inside surface of the right hand wall of the car. This flow of air will be aided by the inductive action of the stream emitted from the right hand conduit 8 which will pass directly upwardly into the canopy. If the left hand side of the car is to be coated on the inside, the positions of the deflectors 17 will be reversed.

In the modification shown-in Figures 3 and 4, a separate attachment is mounted on the car windows in place of the deflector 17. This attachment includes a deflector 28 pivotally connected to clips 29 or other suitable means which may be secured to the top rail of the window frame. The lower edge of the deflector 28 is adjustably supported by longitudinally extensible pivoted links 30 which are provided at the lower end with clips 31 or similar means for connection to the window sill.

into one side of the canopy, said deflecting means being optionally adjustable to cause a similar draft through the body in the opposite direction and thence into the opposite side of the canopy.

4. In a spray coating exhaust system for a hollow body, a canopy supported above the body and having an inlet at each side, means for dischargin an upwardly moving sheet of air along eac side of the body, and means selectively adjustable to cause the air to flow directly upwardly at each side into the canopy or to deflect either sheet into and through the body to a confluence with the other sheet.

In testimony whereof I have hereunto signed my name to this specification.

EDSON G. WHITMORE.

In addition to the use of the invention in 1 painting the inside of the car, the deflector 17 may obviously be adjusted to direct a stream of air over the roof of the car when "the latter is being painted. The invention may also be used in painting the outside surfaces of the sides of the car, in which case a thin sheet of air is directed upwardly near the surface being coated and prevents the fumes and dust from reaching the operator. It is apparent that the specific construction of the invention may also be modified considerably without departing from the scope of the invention as claimed.

What I clai. is:

1. In a spray coating exhaust system for hollow bodies, a canopy supported above .the body, means for discharging air under pressure in a thin sheet upwardly along the outside surface of the body, and means for deflecting said air into! and through the body from one side to the other and thence upwardly outside the body and into the canopy.

2. In a spray coating exhaust system for hollow bodies, a canopy supported above the body, means for creating a draft of air in a thin upwardly moving sheet at each side of the body, like deflecting means at each side of-the body, the deflecting means at either side being selectively adjustable .to direct i flthedraftinto the body at that side, while 

